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"I just said: 'What's black and white and eats like a horse?''" he said.

"I didn't mention anything about anyone over there."

Senator Reynolds was having none of it, saying it wasn't the first time the opposition had made disparaging remarks about Senator Cash.

She pointed to Labor senator Doug Cameron's comment earlier this week that Senator Cash needed to hold a male colleague's hand, and another earlier this year calling both women "silly little schoolgirls".